How to Mock class variable

Question

I am writing test cases using xUnit and Moq.

Currently I am writing test case for Telemetry class.

 public  class TelemetryClientMock : ITelemetryClientMock
    {
       public string key { get; set; } //I want to mock key variable.
        private TelemetryClient telemetry;  
        public TelemetryClientMock( )
        {
            telemetry = new TelemetryClient() { InstrumentationKey = key };
        }



        public void TrackException(Exception exceptionInstance, IDictionary<string, string> properties = null)
        {

              telemetry.TrackException(exceptionInstance, properties);
        }

        public void TrackEvent(string eventLog)
        {
            telemetry.TrackEvent(eventLog);
        }

    }

In Test class how can I mock, key variable.I used to write below code for mocking method.

          [Fact]
            public void TrackException_Success()
            {
                Exception ex=null;
                IDictionary<string, string> dict = null;
               var reader = new Mock<ITelemetryClientMock>();
                var mockTelemetryClient = new Mock<ITelemetryClientMock>();
//mocking method below
                mockTelemetryClient
                    .Setup(data => data.TrackException(It.IsAny<Exception>(), It.IsAny<IDictionary<string, string>>()));
                this._iAppTelemetry = new AppTelemetry(mockTelemetryClient.Object);
                this._iAppTelemetry.TrackException(ex,dict);
            }

How can I mock variable.

Marko Papic · Accepted Answer · 2019-07-21 10:14:09Z

5

You can achieve this using Setup, SetupProperty, SetupGet, depending on what you want:

mockTelemetryClient.Setup(x => x.key).Returns("foo");

or

mockTelemetryClient.SetupProperty(x => x.key, "foo");

or

mockTelemetryClient.SetupGet(x => x.key).Returns("foo");

As Alves RC pointed out, it is assumed that key property exists in ITelemetryClientMock interface.

edited Jul 21, 2019 at 10:14

answered Jul 20, 2019 at 9:37

Marko Papic

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1 Comment

Alves RC Over a year ago

Your answer is correct but I think you could add the following to make sure whatever they're attempting to Mock is "Mockable": "In order to Moq to be able to Mock anything it should be either an Interface or a virtual Property"

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